I expect non-draining explorers as well as drain explorers should be familiar with the expansive Bunker drain, situated in the Cheshire town of Warrington. Built in the 1980s, the Bunker is over 3 miles of mostly concrete pipe, with numerous chambers, steps and terminating at a plughole.

I spent about five hours down here with Mortal Decay, J3bu and Fluxxy, and even then I didn't fully photograph it. Oh well I have an excuse to return one day.

First two are from last year and shot on 35mm film...